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Surname Initial(s)
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Paper Reference (complete below)
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Candidate
No. H 1H
Paper Reference(s)


5016H/1H 5028H/1H Examiner's use only



Edexcel GCSE Team Leader's use only

Additional Science (5016H)
Biology (5028H) Question Leave

B2 ­ Topics 1 to 4 Number Blank




Higher Tier
1
2
Wednesday 5 March 2008 ­…

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2
*N33028A0212*

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1. Newts are small animals that live in ponds.
A newt can regenerate a leg if one is accidently cut off.
The diagrams show the regeneration of the leg over a 24 day period.



leg cut
off here

stump




(a) Name the type of cell division that results…

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2. Sonja, William and Stefan noticed that grass grows less well the nearer it is to a tree.




I think that the tree is using up the
minerals in the soil and so the grass
near it is not getting enough nitrates.



Sonja
I think that the tree…

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(b) Explain why Stefan's idea is likely to be incorrect.

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(2)

(c) The three pupils decide to investigate Sonja's idea by varying the concentration of
nitrates given to samples of grass grown in the laboratory.

(i) Sonja's task is to find a range of…

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3. A model fermenter was used to investigate the effect of stirring the mixture at different
speeds.

Two pH probes were put into the fermenter, one at the top and one at the bottom.



motor




mixture of nutrients
and microorganisms

pH computer
probes




paddle




The paddles were spun…

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(a) Complete the graph by plotting the pH at the bottom of the fermenter against the
speed of the paddles. Draw a line of best fit.
The pH at the top of the fermenter has already been plotted.






pH at top and bottom of fermenter




4­…

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(c) State why stirring the mixture effectively is a key process in the efficient use of a
fermenter.

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(1) Q3

(Total 6 marks)




8
*N33028A0812*

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4. The graph shows the peak concentration of sulphur dioxide in the air of UK towns from
1990 to 2002.

800

700
Peak concentration of sulphur dioxide




600

500
in mg / m3




400

300

200

100

0
1990 1992 1994 1996 1998 2000 2002

Year

(a) Suggest…

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5. Scientists are studying whether it would be possible to live on the planet Mars.
They are designing a dome for 50 people to live in for up to ten years.
The dome must be completely self supporting. To test this, a dome will have to be built…

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